org.bouncycastle.openpgp.operator.jcajce.JceAEADCipherUtil Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.openpgp.operator.jcajce;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.jcajce.spec.AEADParameterSpec;
import org.bouncycastle.util.Arrays;

public class JceAEADCipherUtil
{
    static void setUpAeadCipher(Cipher aead, SecretKey secretKey, int mode, byte[] nonce, int aeadMacLen, byte[] aad)
        throws InvalidKeyException, InvalidAlgorithmParameterException
    {
        AlgorithmParameterSpec parameters =  new GCMParameterSpec(((aeadMacLen + 7) / 8) * 8, nonce);

        aead.init(mode, secretKey, parameters);
        aead.updateAAD(aad);
    }

    static class GCMParameters
        extends ASN1Object
    {
        private byte[] nonce;
        private int icvLen;

        public GCMParameters(
            byte[] nonce,
            int    icvLen)
        {
            this.nonce = Arrays.clone(nonce);
            this.icvLen = icvLen;
        }

        public byte[] getNonce()
        {
            return Arrays.clone(nonce);
        }

        public int getIcvLen()
        {
            return icvLen;
        }

        public ASN1Primitive toASN1Primitive()
        {
            ASN1EncodableVector v = new ASN1EncodableVector(2);

            v.add(new DEROctetString(nonce));

            if (icvLen != 12)
            {
                v.add(new ASN1Integer(icvLen));
            }

            return new DERSequence(v);
        }
    }
}